Results 41 to 50 of about 11,793 (207)

VERA’s 20 yr Evolution in Science and Technology

Galaxies
We review the past 20 yr evolution of VERA (VLBI Exploration of Radio Astrometry) in both science and techinology. VERA is a VLBI array in Japan which consists of four 20 m-diameter telescopes, originally dedicated to phase-referencing VLBI astrometry ...
Mareki Honma, Tomoya Hirota, Tomoaki Oyama, Akiharu Nakagawa   +3 more
doaj   +1 more source

The VERA project (VLBI Exploration of Radio Astrometry) [PDF]

Proceedings of the International Astronomical Union, 2004
VLBI – Very Long Baseline Interferometry – is a radio interferometry technique which provides the highest spatial resolution observations to human kind. But at the present, the accuracy of the astrometry observations is limited by the atmospheric light path variations and instrumental phase errors, and only group delay measurements are used.
Hideyuki Kobayashi, Noriyuki Kawaguchi, Seiji Manabe, Toshihiro Omodaka, Katsunori Shibata, Mareki Honma, Yoshiaki Tamura, Osamu Kameno, Tomoya Hirota, Hiroshi Imai   +9 more
openaire   +1 more source

A Radio--Optical Reference Frame VIII. CCD observations from KPNO and CTIO: internal calibration and first results

, 1995
In this pilot investigation, precise optical positions in the FK5 system are presented for a set of 16 compact extragalactic radio sources, which will be part of the future radio--optical reference frame.
de Vegt, C., Johnston, K. J., Winter, L., Zacharias, N.   +3 more
core   +1 more source

Astrometry of Galactic Star-Forming Region Onsala 1 with VERA: Estimation of Angular Velocity of Galactic Rotation at Sun [PDF]

, 2010
We conducted the astrometry of H2O masers in the Galactic star-forming region Onsala 1 (ON1) with VLBI Exploration of Radio Astrometry (VERA). We measured a trigonometric parallax of 0.404+/-0.017 mas, corresponding to a distance of 2.47+/-0.11 kpc.
HANDA, Toshihiro, HONMA, Mareki, KAWAGUCHI, Noriyuki, KOBAYASHI, Hideyuki, MIYAJI, Takeshi, NAGAYAMA, Takumi, NAKAGAWA, Akiharu, OMODAKA, Toshihiro, 中川, 亜紀治, 半田, 利弘, 宮地, 竹史, 小林, 秀行, 川口, 則幸, 本間, 希樹, 永山, 匠, 面髙, 俊宏   +15 more
core   +1 more source

Mid-Infrared Imaging of NGC 6334 I [PDF]

, 2002
We present high-resolution (
Caswell J. L., Cesaroni R., Charles M. Telesco, Ellingsen S. P., Forster J. R., James M. De Buizer, James T. Radomski, Neckel T., Persi P., Persi P., Robert K. Pina, Tapia M.   +11 more
core   +2 more sources

The jet of the Low Luminosity AGN of M81

EPJ Web of Conferences, 2013
In this contribution, we summarize our main results of a big campaign of global VLBI observations of the AGN in M81 (M81*) phase-referenced to the radio supernova SN 1993J.
Alberdi A., Martí-Vidal I., Marcaide J.M., Guirado J.C., Pérez-Torres M.A., Ros E., Brunthaler A.   +6 more
doaj   +1 more source

An Updated Reference Frame for the Galactic Inner Parsec

The Astrophysical Journal, 2023
Infrared observations of stellar orbits about Sgr A* probe the mass distribution in the inner parsec of the Galaxy and provide definitive evidence for the existence of a massive black hole.
Jeremy Darling, Jennie Paine, Mark J. Reid, Karl M. Menten, Shoko Sakai, Andrea Ghez   +5 more
doaj   +1 more source

The catalogue of positions of optically bright extragalactic radio sources OBRS-1

, 2011
It is expected that the European Space Agency mission Gaia will make possible to determine coordinates in the optical domain of more than 500000 quasars.
Beasley, Charlot, Condon, Fomalont, Helmboldt, Kovalev, L. Petrov, Lanyi, Lindegren, Ma, Matveenko, Mignard, Petrov, Petrov, Petrov, Petrov, Petrov, Piner, Pushkarev, Taylor, Zacharias   +20 more
core   +1 more source

Payload Selection Scheme for a Fast‐Response Planetary Defense Scouting Mission: The Satis CubeSat Study

Advances in Astronomy, Volume 2026, Issue 1, 2026.
The continued detection of near‐Earth asteroids with postulated close encounters with Earth is a clear motivation for planetary defense–driven mission designs. Fast reconnaissance in an imminent threat scenario (i.e., less than a few years upon impact) is crucial to gain information about an asteroid potentially impacting the Earth in the near future ...
Markus Patzek, Birgit Ritter, Carsten Güttler, Moritz Goldmann, Özgür Karatekin, Detlef Koschny, Richard Moissl, Valerio Fogliano, Francisco Cabral, Roger Walker, Bastian Gundlach, Michael Kueppers   +11 more
wiley   +1 more source

FAUST. VII. Detection of a Hot Corino in the Prototypical Warm Carbon-chain Chemistry Source IRAS 15398–3359

The Astrophysical Journal, 2023
We have observed the low-mass protostellar source IRAS 15398−3359 at a resolution of 0.″2–0.″3, as part of the Atacama Large Millimeter/Submillimeter Array Large Program FAUST, to examine the presence of a hot corino in the vicinity of the protostar.
Yuki Okoda, Yoko Oya, Logan Francis, Doug Johnstone, Cecilia Ceccarelli, Claudio Codella, Claire J. Chandler, Nami Sakai, Yuri Aikawa, Felipe O. Alves, Eric Herbst, María José Maureira, Mathilde Bouvier, Paola Caselli, Spandan Choudhury, Marta De Simone, Izaskun Jímenez-Serra, Jaime Pineda, Satoshi Yamamoto   +18 more
doaj   +1 more source